/usr/lib/x86_64-linux-gnu/libmtp.so.9 is in libmtp9 1.1.8-1+b1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libmtp.so.9.2.0
/usr/lib/x86_64-linux-gnu/libmtp.so.9.2.0